Channel-milling cutter



Jan. 12 1926.

E. A. ou.

CHANNEL MILLING CUTTER F iied Jan. 7, 1924 attovneq 5 Patented Jan. 12, 1926.

PATENT OFHCE.

EDWARD A. NULL, OF LAKEWOOD, OHIO.

CHANNEL-MILLING CUTTER.

implication filed January 7, 1924. Serial No. 684,732.

To aZl whom it may concern:

Be it known that l, EDCVARD A. Now, a citizen of the United States, residing at l iakewood, in the county of Guyahoga and State of Ohio, have invented a certain new and useful Improvement in Channel-Milling Cutters, of which the following is a full, clear, and exact description.

.llns invention relates to channel milling cutters, and more particularly to the devices for rigidly securing the diagonally disposed cutters in. the peripheral notches of the cutter carrying wheel or annulus.

It an object of the present invention to provide a wcdging lock pin for thecutter which serves to secure the blade against working loose while in use, which may be quickly removed to permit the blade to be detached and which has a positive locking engagement with the cutter blade to prevent outward movement of the blade.

A further object of the invention is to provide a wedge locking pin, engaging in aligned grooves in one wall of the cutter and the adjacent wall of the notch in which the cutter is positioned, which acts upon the blade to wedge the same against a side wall of the notch and also against the bottom of the notch.

A further object is to provide means engaging the inner edge of the blade adjacent the bottom of the notch which serves to rigidly lock the blade against lateral movement but which does not interfere with the removal of the blade.

The following description and accompanying drawings set forth in detail certain means embodying the invention, the disclosed means, however, constituting but one of the various mechanical forms in which the principle of the invention may be employed.

Reference should be had to the accompanying drawings forming a part of this specification in which Fig. 1 is a side elevation of a cutter carrying wheel or annulus with the cutter blades secured in its peripheral notches; Fig. 2 is a development of a portion of the periphery of the cutter;

Fig. 8 is a transverse section through one of the cutters and its locking pin.

Referring to the accompanying drawings,

the cutter consists of a supporting wheel or.

annulus 1 adapted to be keyed to a shaft and provided with diagonally disposed peripheral notches 2 which have the diagonally disposed cutter blades 8 secured therein, the cutter blades being disposed at opposite angles on opposite sides of the cutter wheel and having their inner edges overlapping in staggered relation as is common practice in the art. The cutter blades 3 each have outer and side cutting edges 4 and 5, the cutting edges 4- projecting beyond the periphery of the supporting wheel or annulus, the cutting edges 5 projecting beyond the sides thereof. The notches 2 are straight and of uniform width and each notch intersects a cylindrical bore extending from the side wall of the supporting annulus which forms a cylindrical walled groove 6 in one wall. of the notch. The axes of the cylin- 'drical bores are inclined with respect to the side walls of the notches 2 so that the grooves 6 are of gradually decreasing depth toward their inner ends. In forming the notches 2 and groove 6 the bores are formed from the side walls of the supporting annulus at regularly spaced intervals and at the same angle with respect to the axis of the annulus. The notches are then cut to intersect the bores at the desired angle. Each blade 3 is provided with a longitudinally extending notch 7 in its side wall which is uniform in depth throughout the length of the cutter,'the notch 7 being angular in form and having an inclined bottom wall 8 extending from adjacent the outer side of the notch and inclined outwardly to the outer wall of the blade adjacent its inner edge. The wedge pin 9 is cylindrical in form and of a size to fit in the'cylindrical groove 6. The pin 9 has a longitudinally extending flat face, the plane of which is at a small angle to the longitudinal axis of the pin so thatthe pin is tapered from end to end. lVhen a pin 9 is driven into a groove 6, it is gradually forced toward the cutter blade 3 until the flat face thereof comes into contact throughout its length with the flat bottom wall 8 of the notch 7 of the cutter blade exerting a uniform pressure throughout its length upon the inclined surface 8 of the notch of the cutter blade. The action of the wedge pin 9 is to wedge the cutter blade against the rear wall of the notch 2 and also to wedge the blade against the bottom wall of the notch and since the wedge pin 9 projects into the cutter, the blade is positively locked against outward movement.

In order to provide a positive lock against lateral movement of the blade when in use, which will not interfere with the removal of the blade when the wedge pin 9 visreleased the inner edge of the blade is provided with a transverse groove 10 which receives the end of a pin 11 secured in the bottom of the notch 2.

Having described my invention, 71 claim- In a device of the character describedfithe combination With a supporting member having a cutter receiving notch, of a cutter hav ing a base portion fitting in the notch, of a Wedge member engaging the supporting member and cutter along one side of the notch and exerting an inward wedging action on the cutter, a projection carried by the supportingmember at the bottom of the notch and a transverse groove in the inner edge of the cutter adapted to receive said projection.

In testimony whereof, I hereunto aifix my signature.

EDWARD A. NOLL. 

